Windows Game Programming for Dummies (2nd Edition)/WinGamProgFD.iso/pc/Source/GPCHAP09/PROG9_5.CPP

C/C++ Source or Header | 2002-04-25 | 11.4 KB | 386 lines

// PROG9_5.CPP - creates a palett, draws color bars
// and animated them with color rotation

// INCLUDES ///////////////////////////////////////////////
#define WIN32_LEAN_AND_MEAN
#define INITGUID

#include <windows.h>   // include important windows stuff
#include <windowsx.h>
#include <mmsystem.h>
#include <iostream.h> // include important C/C++ stuff
#include <conio.h>
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <math.h>
#include <io.h>
#include <fcntl.h>

#include <ddraw.h>  // directX includes

// DEFINES ////////////////////////////////////////////////

// defines for windows
#define WINDOW_CLASS_NAME "WINXCLASS"  // class name

#define WINDOW_WIDTH  640              // size of window
#define WINDOW_HEIGHT 480
#define SCREEN_WIDTH  640              // size of screen
#define SCREEN_HEIGHT 480
#define SCREEN_BPP    8                // bits per pixel
#define MAX_COLORS    256              // maximum colors

// MACROS /////////////////////////////////////////////////

// these read the keyboard asynchronously
#define KEY_DOWN(vk_code) ((GetAsyncKeyState(vk_code) & 0x8000) ? 1 : 0)
#define KEY_UP(vk_code)   ((GetAsyncKeyState(vk_code) & 0x8000) ? 0 : 1)

// this builds a 16 bit color value in 5.5.5 format (1-bit alpha mode)
#define _RGB16BIT555(r,g,b) ((b & 31) + ((g & 31) << 5) + ((r & 31) << 10))

// this builds a 16 bit color value in 5.6.5 format (green dominate mode)
#define _RGB16BIT565(r,g,b) ((b & 31) + ((g & 63) << 5) + ((r & 31) << 11))


// TYPES //////////////////////////////////////////////////

typedef unsigned short USHORT;
typedef unsigned short WORD;
typedef unsigned char  UCHAR;
typedef unsigned char  BYTE;

// PROTOTYPES /////////////////////////////////////////////

int Game_Init(void *parms=NULL);
int Game_Shutdown(void *parms=NULL);
int Game_Main(void *parms=NULL);
void Draw_Hline(int xs, int xe, int y, int color, UCHAR *vbuffer, int bytes_per_line);

// GLOBALS ////////////////////////////////////////////////

HWND main_window_handle = NULL; // save the window handle
HINSTANCE main_instance = NULL; // save the instance
char buffer[80];                // used to print text

LPDIRECTDRAW7        lpdd         = NULL;  // dd object
LPDIRECTDRAWSURFACE7 lpddsprimary = NULL;  // dd primary surface
LPDIRECTDRAWSURFACE7 lpddsback    = NULL;  // dd back surface
LPDIRECTDRAWPALETTE  lpddpal      = NULL;  // a pointer to the created dd palette
DDSURFACEDESC2       ddsd;                 // a direct draw surface description struct
DDSCAPS2             ddscaps;              // a direct draw surface capabilities struct
HRESULT              ddrval;               // result back from dd calls
PALETTEENTRY         palette[MAX_COLORS];  // the color palette

// FUNCTIONS //////////////////////////////////////////////

LRESULT CALLBACK WindowProc(HWND hwnd,
                            UINT msg,
                            WPARAM wparam,
                            LPARAM lparam)
{
// this is the main message handler of the system
PAINTSTRUCT    ps;           // used in WM_PAINT
HDC            hdc;       // handle to a device context

// what is the message
switch(msg)
    {
    case WM_CREATE:
        {
        // do initialization stuff here
        return(0);
        } break;

    case WM_PAINT:
         {
         // start painting
         hdc = BeginPaint(hwnd,&ps);

         // end painting
         EndPaint(hwnd,&ps);
         return(0);
        } break;

    case WM_DESTROY:
        {
        // kill the application
        PostQuitMessage(0);
        return(0);
        } break;

    default:break;

    } // end switch

// process any messages that we didn't take care of
return (DefWindowProc(hwnd, msg, wparam, lparam));

} // end WinProc

// WINMAIN ////////////////////////////////////////////////

int WINAPI WinMain(    HINSTANCE hinstance,
                    HINSTANCE hprevinstance,
                    LPSTR lpcmdline,
                    int ncmdshow)
{

WNDCLASS winclass;    // this will hold the class we create
HWND     hwnd;        // generic window handle
MSG         msg;        // generic message
HDC      hdc;       // generic dc
PAINTSTRUCT ps;     // generic paintstruct

// first fill in the window class stucture
winclass.style            = CS_DBLCLKS | CS_OWNDC |
                          CS_HREDRAW | CS_VREDRAW;
winclass.lpfnWndProc    = WindowProc;
winclass.cbClsExtra        = 0;
winclass.cbWndExtra        = 0;
winclass.hInstance        = hinstance;
winclass.hIcon            = LoadIcon(NULL, IDI_APPLICATION);
winclass.hCursor        = LoadCursor(NULL, IDC_ARROW);
winclass.hbrBackground    = (HBRUSH)GetStockObject(BLACK_BRUSH);
winclass.lpszMenuName    = NULL;
winclass.lpszClassName    = WINDOW_CLASS_NAME;

// register the window class
if (!RegisterClass(&winclass))
    return(0);

// create the window, note the use of WS_POPUP
if (!(hwnd = CreateWindow(WINDOW_CLASS_NAME, // class
                          "WinX Game Console",     // title
                          WS_POPUP | WS_VISIBLE,
                           0,0,       // x,y
                          WINDOW_WIDTH,  // width
                          WINDOW_HEIGHT, // height
                          NULL,       // handle to parent
                          NULL,       // handle to menu
                          hinstance,// instance
                          NULL)))    // creation parms
return(0);

// save the window handle and instance in a global
main_window_handle = hwnd;
main_instance      = hinstance;

// perform all game console specific initialization
Game_Init();

// enter main event loop
while(1)
    {
    if (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
        {
        // test if this is a quit
        if (msg.message == WM_QUIT)
           break;

        // translate any accelerator keys
        TranslateMessage(&msg);

        // send the message to the window proc
        DispatchMessage(&msg);
        } // end if

    // main game processing goes here
    Game_Main();

    } // end while

// shutdown game and release all resources
Game_Shutdown();

// return to Windows like this
return(msg.wParam);

} // end WinMain

// WINX GAME PROGRAMMING CONSOLE FUNCTIONS ////////////////

int Game_Init(void *parms)
{
// this function is where you do all the initialization
// for your game

// create object and test for error
if (DirectDrawCreateEx(NULL, (void **)&lpdd, IID_IDirectDraw7, NULL)!=DD_OK)
   return(0);

// set cooperation level to windowed mode normal
if (lpdd->SetCooperativeLevel(main_window_handle,
           DDSCL_ALLOWMODEX | DDSCL_FULLSCREEN |
           DDSCL_EXCLUSIVE | DDSCL_ALLOWREBOOT)!=DD_OK)
    return(0);

// set the display mode
if (lpdd->SetDisplayMode(SCREEN_WIDTH,SCREEN_HEIGHT,SCREEN_BPP,0,0)!=DD_OK)
   return(0);

// Create the primary surface
memset(&ddsd,0,sizeof(ddsd));
ddsd.dwSize         = sizeof(ddsd);
ddsd.dwFlags        = DDSD_CAPS;
ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE;

if (lpdd->CreateSurface(&ddsd,&lpddsprimary,NULL)!=DD_OK)
   return(0);

// create palette data
// first clear out all the entries, defensive programming
memset(palette,0,256*sizeof(PALETTEENTRY));

// create a R,G,B,GR gradient palette
for (int index=0; index<256; index++)
    {
    if (index < 64) // shades of red
        palette[index].peRed = index*4;
    else           // shades of green
    if (index >=64 && index < 128)
        palette[index].peGreen = (index-64)*4;
    else           // shades of blue
    if (index >=128 && index < 192)
       palette[index].peBlue = (index-128)*4;
    else           // shades of grey
    if (index >=192 && index < 256)
        palette[index].peRed = palette[index].peGreen =
        palette[index].peBlue = (index-192)*4;

    // set flags
    palette[index].peFlags = PC_NOCOLLAPSE;
    } // end for index

// now create the palette object
if (lpdd->CreatePalette(DDPCAPS_8BIT | DDPCAPS_INITIALIZE | DDPCAPS_ALLOW256,
                         palette,&lpddpal,NULL)!=DD_OK)
   return(0);

// attach the palette to the primary
if (lpddsprimary->SetPalette(lpddpal)!=DD_OK)
   return(0);

// return success
return(1);
} // end Game_Init

///////////////////////////////////////////////////////////

int Game_Shutdown(void *parms)
{
// this function is where you shutdown your game and
// release all resources that you allocated

// first release the palette
if (lpddpal!=NULL)
   lpddpal->Release();

// now release the primary surface
if (lpddsprimary!=NULL)
   lpddsprimary->Release();

// release the directdraw object
if (lpdd!=NULL)
   lpdd->Release();

// return success
return(1);
} // end Game_Shutdown

///////////////////////////////////////////////////////////

int Game_Main(void *parms)
{
// this is the workhorse of your game it will be called
// continuously in real-time this is like main() in C
// all the calls for you game go here!

PALETTEENTRY work_colors[256]; // used to perform the algorithm

// this will be aliased to the video memory
UCHAR *video_buffer = NULL;

// check of user is trying to exit
if (KEY_DOWN(VK_ESCAPE) || KEY_DOWN(VK_SPACE))
    PostMessage(main_window_handle, WM_DESTROY,0,0);

// draw the colored bars here
// set up the surface description to lock the surface
memset(&ddsd,0,sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);

// lock the primary surface, note in a real game you would
// do this once per frame
lpddsprimary->Lock(NULL,&ddsd,
             DDLOCK_SURFACEMEMORYPTR | DDLOCK_WAIT,NULL);

// get video pointer, we could have just as easily used
// ddsd.lpSurface, but I like to alias the ptr
video_buffer = (UCHAR *)ddsd.lpSurface;

// draw a collection of horizontal lines each with a different color
// using a function defined below
for (int y=0; y<SCREEN_HEIGHT; y++)
    Draw_Hline(0,SCREEN_WIDTH-1, // starting and ending x
               y,                // y position
               y % MAX_COLORS,   // color of line
               video_buffer,     // destination memory
               ddsd.lPitch);     // bytes per line

// unlock the surface, very important!
lpddsprimary->Unlock(NULL);

// perform a color rotation on all 256 colors, the technique
// is like taking all the 256 colors and shifting once to the
// right (or left) and then taking the last color and pouring
// it into the first, in reality you would do this a little
// differently, for example use a shadow data area to hold the
// color rather than querrying them with GetEntries(), but this
// is a good example of using GetEntries() and SetEntries()
// notice we don't have to lock the primary display or anything
// like that, note that these functions are very slow, better
// to just change the entire palette at once!


// get the color palette
lpddpal->GetEntries(0,0,256,work_colors);

// shift and store at 1-255
lpddpal->SetEntries(0,1,255,work_colors);

// now store color 255 at 0
lpddpal->SetEntries(0,0,1,&work_colors[255]);


// wait a sec
Sleep(1);

// return success
return(1);
} // end Game_Main

///////////////////////////////////////////////////////////

void Draw_Hline(int xs, int xe, int y, int color, UCHAR *vbuffer, int bytes_per_line)
{
// this function draws a horizontal line, in a 256 color mode, notice
// that it takes into consideration the memory pitch of the mode

// compute starting video address of video line
UCHAR *video_addr = vbuffer + y*bytes_per_line;

// now were on the correct video line, so draw the line
// draw the line a byte at a time
for (int x=xs; x<=xe; x++)
    video_addr[x] = (UCHAR)color;

// or you could do this
// memset((void *)(video_addr+xs),(UCHAR)col,xe-xs+1);

} // end Draw_Hline